Brushless direct current motor starting system and method, controller and storage medium

Abstract

The invention discloses a brushless direct current motor starting system and method, a controller and a computer readable storage medium, the brushless direct current motor starting system comprises a frequency converter and a load motor, and the frequency converter comprises a three-phase full-bridge rectifier and a feedback control circuit; the feedback control circuit comprises a current acquisition circuit, a speed acquisition module and a control circuit; the speed acquisition module comprises an observer, a phase-locked loop and a parameter filler connected with the observer; the parameter filler is used for outputting initial parameters of the load motor to the observer according to a preset motor model when the load motor is started; the observer is used for outputting an initial motor rotating speed observation result when the load motor is started by utilizing the initial parameters; and the phase-locked loop is used for limiting the amplitude of the initial motor angular speed in the initial motor rotating speed observation result output by the observer. According to the invention, the parameter filler provides the initial parameters to the observer, the observer uses the initial parameters to accelerate the convergence speed, and meanwhile, the phase-locked loop can limit the amplitude and improve the starting robustness.

Description

technical field [0001] The present invention relates to the field of computer technology, and in particular, to a brushless DC motor starting system, method, controller and computer-readable storage medium. Background technique [0002] With the continuous improvement of industrial automation, frequency converters have been widely used in the automatic control of motors. In this context, how to effectively control motors by frequency converters has become a major point. [0003] In the prior art, the brushless DC motor usually adopts the I-F semi-closed loop startup strategy. After the motor runs to a certain speed, it switches to the position sensorless closed-loop control. The fluctuation of speed and torque is not applicable in some occasions with high requirements on starting speed and torque. [0004] For this reason, a more stable starting system for the starting period of a brushless DC motor is required. SUMMARY OF THE INVENTION [0005] In view of this, the purp...

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Problems solved by technology

[0003] In the prior art, the brushless DC motor usually adopts the I-F semi-closed-loop starting strategy. After the motor runs to a certain speed, it switches to the position sensorless closed-loop control. However, when the I-F semi-closed-loop control switches to the position sensorless closed-loop, it will generate The speed and torque fluctuate, which is not suitable for some occasions that require high starting speed and torque

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